The Khewra Salt Mine (or Mayo Salt Mine) is located in
Khewra, north of Pind Dadan Khan, an administrative subdivision of Jhelum
District, Punjab, Pakistan. It is Pakistan's largest and oldest salt mine and
the world's second largest. It is a major tourist attraction, drawing up to
250,000 visitors a year. Its history dates back to its discovery by Alexander's
troops in 320 BC, but it started trading in the Mughal era. The main tunnel at
ground level was developed by Dr. H. Warth, a mining engineer, in 1872, during
British rule. After partition the Pakistan Mineral Development Corporation took
over the
